Effect of initial energy of hydrogen atoms on trapping and reaction in solid methane at 4 K

1982 ◽  
Vol 86 (10) ◽  
pp. 1781-1784 ◽  
Author(s):  
Akihiro Wakahara ◽  
Tetsuo Miyazaki ◽  
Kenji Fueki
Keyword(s):  
Initial Energy ◽  
Hydrogen Atoms ◽  
Solid Methane

Effect of initial energy of hydrogen atoms on reactions and trapping in solid hydrogen at 4 K

1983 ◽  
Vol 87 (9) ◽  
pp. 1611-1613 ◽  
Author(s):  
Tetsuo Miyazaki ◽  
Haruyuki Tsuruta ◽  
Kenji Fueki
Keyword(s):  
Initial Energy ◽  
Solid Hydrogen ◽  
Hydrogen Atoms

Effect of initial energy of hydrogen atoms on two-site trapping in solid argon at 4 K

1982 ◽  
Vol 86 (19) ◽  
pp. 3881-3883 ◽  
Author(s):  
Tetsuo Miyazaki ◽  
Akihiro Wakahara ◽  
Takahiro Usui ◽  
Kenji Fueki
Keyword(s):  
Initial Energy ◽  
Hydrogen Atoms ◽  
Solid Argon

HIGH ENERGY REACTIONS OF ATOMIC HYDROGEN

1960 ◽  
Vol 38 (10) ◽  
pp. 1722-1733 ◽  
Author(s):  
Michael Henchman ◽  
David Urch ◽  
Richard Wolfgang
Keyword(s):  
Atomic Hydrogen ◽  
Organic Molecules ◽  
High Energy ◽  
Initial Energy ◽  
Hydrogen Atoms ◽  
Collision Efficiency ◽  
Detailed Mechanism ◽  
Thermal Reactions ◽  
High Kinetic Energy ◽  
Very High

The chemistry of hot hydrogen atoms has been studied using tritium of high kinetic energy as produced by nuclear recoil. The possibilities and limitations of this technique are discussed using a collision theory for reactions of atoms having a very high initial energy. Using this theory and certain experimental data, it is concluded that hot hydrogen atoms react to combine with organic molecules at very high collision efficiency (of the order of approximately 0.2 to 0.4) in the energy range 3–10 ev. There is no indication that collisions at much higher energies lead to combination. With most systems, e.g. alkanes, a wide variety of reactions is observed. The systematics of these hot reactions is discussed and evidence on their detailed mechanism is presented. It appears that most products are formed by a fast displacement of an atom or group by the hot hydrogen. There is no evidence for the formation of a common, internally equilibrated, collision complex which decays on a statistically determined basis to the various products. Instead, the course of the reactions seems largely governed by the direction and point of impact of the hot atom. Thus, stereochemical evidence indicates that axial approach of the hot hydrogen atom along the C—H bond axis leads to abstraction while approach at large angles to this axis results in displacement without Walden inversion. In some cases sufficient excitation energy is introduced in the hot displacement process to cause further decomposition of the primary product. This model of high-energy reactions is compared with that of thermal reactions and its general implications are briefly discussed.

Remarks on the diffuse interstellar lines

1967 ◽  
Vol 31 ◽  
pp. 91-93 ◽  
Author(s):  
G. Herzberg
Keyword(s):  
Hydrogen Atoms ◽  
Interstellar Gas

It is suggested that the diffuse interstellar lines are produced in the interstellar gas by molecules consisting of a few hydrogen atoms and one other atom, such as CH4+ or NH4. Diffuseness of the lines is assumed to result from predissociation of these molecules.

SURFACE PLASMA SOURCE OF HYDROGEN ATOMS WITH AN ENERGY OF HUNDREDS eV

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-479-C7-480 ◽  
Author(s):  
V. G. Dudnikov ◽  
G. I. Fiksel'
Keyword(s):  
Plasma Source ◽  
Surface Plasma ◽  
Hydrogen Atoms

H NMR Evidence for a Change in The Local Hydrogen Environment of Sites Associated with the Staebler-Wronski Effect in a-Si:H

2002 ◽  
Vol 715 ◽  
Author(s):  
T. Su ◽  
Robin Plachy ◽  
P. C. Taylor ◽  
S. Stone ◽  
G. Ganguly ◽  
...  
Keyword(s):  
Line Shape ◽  
Defect Density ◽  
Hydrogen Atoms ◽  
Hydrogen Environment ◽  
H Nmr ◽  
Line Shapes ◽  
Different Temperatures ◽  
Staebler Wronski Effect

AbstractWe study the H NMR line shapes of a sample of a-Si:H under several conditions: 1) as grown, 2) light-soaked for 600 hours, and 3) light-soaked followed by annealing at different temperatures. At T = 7 K, the NMR line shape of the sample after light soaking exhibits an additional doublet compared to that of the sample as-grown. This doublet is an indication of a closely separated hydrogen pair. The distance between the two hydrogen atoms is estimated to be about (2.3 ± 0.2) Å. The concentration of these hydrogen sites is estimated to be between 1017 and 1018 cm-3 consistent with ESR measurements of the defect density after light soaking. This doublet disappears after the sample is annealed at 200°C for 4 hours.

Formation of surface layer of hydrogen in pure aluminum

2019 ◽  
Vol 484 (1) ◽  
pp. 56-60
Author(s):  
D. A. Indejtsev ◽  
E. V. Osipova
Keyword(s):  
Surface Layer ◽  
Hydrogen Atom ◽  
Ab Initio ◽  
Pure Aluminum ◽  
Hydrogen Atoms ◽  
Energy Characteristics ◽  
Aluminum Crystal

Hydrogen atom behavior in pure aluminum is described by ab initio modelling. All main energy characteristics of the system consisting of hydrogen atoms in a periodic aluminum crystal are found.

Sign in / Sign up

Export Citation Format

Share Document